Internal-combustion engine



Feb. 13, 1923. 1,145,319.' FA S. JELBARW. lNTERNAL COMBUSTION ENGINE.

FILED AUG.7,1919 2 SHEETS-SHEET l.

F. S. JELBART.

INTERNAL COMBUSTIONENGiNE. HLED/{ua.1,1s19.

2 SHEETSMSHEET 2.

d wwwa@ y gines, of which the tion.

a ing chamber.

VICTORIA, AUSTRALIA.

INTERNAL-coiyiBUsTroN ENGINE.

Application iea August 7, 1919. ser/iai No. 315,979.

To all whom t may concern.' i

Be it known that I, FRANK STAFFORD JEL- BART, a subject of the King of Great Britain, residing at 11 Pleasant Street south, Balla/rat, Victoria, Australia, have invented certain new and useful Improvements in and Connected with vInternal-Combustion Enfollowing is a specifica- This invention relates to improvements in and i fuels for use h two stroke cycle internal combustion engines.

.The object simple and eans are provided for i regulating the How admission o-f air to the vapouriz- In order that the invention may be readily understood reference will now be made'to t e accompanyingv sheetsof explanatory rawings wherein` Y igure 1 is a view in sectional elevation of a two cycle enginel embodying the improvements comprised in the present inven.

tion.

Figure 2 is a two cycle engine shown in Figure 1.

yFigure?) is a" view in end elevation of the view in sectional plan of the said two cycle engine and with the improvements the present invention. i Figure 4 is a view in sectional cylinder heads and -parts attached to enable a vapourizing chamber a preheating `chamber 13 to be formed therein in such a mannerh that the h they can be fitted thereto in manner as by bolts, set-screws iziiig nipple 17 and passage 18 tofaport leading to the vapourizing chamber 12 upon the compression stroke of the piston 20.

The passage 18 is open to the atmosphere and the compression stroke of the piston causes air tobe drawn forcibly past the nipple 17 and thereby atomizes the fuel prior to it passing to the vapourizing chamber 12.

The port 19 leading to the vapourizing chamber 12 is fitted with a valve 21. which is operated by lever and link mechanism 22 from a cam 23'itted to the crank shaft 24 of the engine'to to the said chamber 12 inand the lever and link mechanism 22 may be adjusted to permit of th cylinder 11V as shown said valve beinglso regulated as to permit the flow of fuel to the vapourizing chamber being controlled as desired.

which is fitted with a pipe end of the cylinder..

`into the vaporizing ch -of the engine cylinder and -just in advance of the piston when it is at the endof its working stroke.

A pipe 27 passes Afrom the second port 27 to a. port 31 in the crank ease 'or in the If preferred the pipe 27 can be arrangedto pass from the'port 27 lso y said-crank case in such a way l of the compression stroke of the piston 20.

` mitted tothe cranklrcase to a reservoir for compressed air or to a Pump passed under pressure when required. y

l A passage `30 passes from the charge admission port 29 in the-cylinder to the crank case 31 and this said .passage permits air to be passed with sufficient velocity from the to the cylinder to induce a flow of vapourized fuel from the vapourizing chamber 12 prior to the commencement to the said port as and An air admission port 32 is formed in the side of the back end ofthe crank case 31 and this port is fitted with a valve 33 which is designed to open under 4the iniuenceA of a; minus'pressure produced in and back end of the cylinder when the piston 'is movingforward on its compression stroke.

The valve 33 on can be connected to a lever34 which is con-l trolled by the lever andlink mechanism 22 that the said'valve will open than the valve 21 controlling of fuel to the vapourizing Figure 2 of the drawings.

be made to fit tightlyF on alittle later the admission chamber 12,'see

rllhe valve 33 'can its seat'to prevent the cra-nkcase through the port 32 when sufficient air is introduced with the liquid fuel to the vapourizing chamber to provide a satisfactory explosive mixture or the said valve can be controlled as above described to permit of a regulated supply of air to beadthrough the port 32.

In operatinn, when the piston 2O of the. engine is moving forward on its compression stroke the minus pressure produced in dthe crank case 31 and consequently in the passage 30, pipe 28 and pipe 27 induces atomized fuel and air tobe drawn into the `va pourizing chamber.

operation of Iduced into the vapourizing cham the lfuel into a fine.4

" The atomized back hot shown). from whichY air may beV combination hereinbefore the v drawings in Figure 5 of .is dispensed with and the fuel is forced in the crank case the air admission port 323 the admission of air tol The valve 32 is arranged to open to admit air to the crank case either by the minus pressure produced in the latter or by -the 22 after the atomized fuel and air is introber 12.

When the piston has moved near to the end of its working stroke and opens the port 29 a portion of the air compressed within the crank case rushes into the cylinder` by way ofpassage 30 and port' 29 and scavenges the cylinder of all exhaust gases, and before the piston moves forwardly to close the said the lever and link mechanism port some of the compressed air passes byway of pipe 27 tothe `vapourizing chamber 12 and forces the vapourizing fuel or fuel andair therefrom to the cylinder by way of pipe 28 and the charge admission port 29.

fuel from the 4vapourizing chamber is .thoroughly admixed and evenly diffused'throughl the lair passing from the crank'case to the cylinder thereby ensuring a highly satisfactory explosive mixture.

By arranging a preheating chamber 13 in with avapourizing chamber as be readily atomized and vapourizedl even in cold weather thereby enabling an engine to be run economically without sacrificing its efficiency; When light or more 'volatile oil'is used for fuel it may be delivered direct to the float chamber 16 throughl the pipe 36 (see Figures 2 and 3 of and without passing it first through the preheating chamber.

In the modification of the invention shown the drawings the carburetter regulated quantities into the vapourizing chamber 12 by means of a pumpI 37 or the -likewhich is operated in any suitable way at correct intervals from some movable part of the engine. The fuel is drawn from a tank or reservoir 38 and delivered by the pump 37 through a pipe 39 to a preheating chamber 40formed 'on or fitted 'to the head of the cylinder l11 from which it passes in a heated condition toK the vapourizing chamber 12 whenmthe port 19 isopened. 'Y

The heated oil delivered to .the vapourizing chamber 12 isneiec'tually vapourized by the heat from the walls of-said\ chamber' and by the flow of yair which passessaid chamber from the fpipe27! charge admission'l port 29 is'fopened by the rearward movement of the piston "20 and redelivered to the cylinder.

In this vapourize the fuel is admitted to the crank described veryfheavy oils can of the carburetter through the when the form of the invention/the air to case 31 through the air admission port 32 in I the manner hereinbefore described. i

In order to provide means for permitting the vapourizing chamber 12 to be cleaned out as and' when desired an outlet port 41 is to How under a screw plug 42 or the like. eating chamber 13 may be cleaned out by unscrewing the couplings of the pipes 14 and l5 therefrom and introducing a scraper or like device in the` inlet or outlet.

means for supplying a regulated quantity of ber, means for retaining t e v aporiz'ed fuel in said chamber while tIie he working stroke of said 2. In a two-cycle internal combustion engine, a cylinder aving a. vaporizing chamber formed in its. head port arranged at its side, a. piston in said cylinder, means for supplying a regulated quantity of fuel to the said chamber, means for supplying air under pressure to the vaporizing chamber, and means for passing the vaporized fuel and airl from the Vaporizing chamber to the charge inlet port in the side of the engine cylinder at the completion of the working stroke of the piston in the cylinder.

3. In a two-cycle interna-l combustion engine, a cylinder having a vaporizing chamaf regulated quantity of fuel to the chamber, and means whereby air is induced pressure from the crank direct to the. c arge inlet ther cylinder and from the crank case through In a` two-cycle internal combustionengine, a. cylinder having a` vaporizing chamber formed in the head thereof, ay piston in the cylinder, a

in the cylinder, a port in the vaporizing chamber arranged in communication with the charge inlet port in the side of the cylinder and with the crank case, a` second port in the and a charge inlet` charge inlet port in the sideV whereby the charge of fuel delivered to the vaporizing chamber upon the stroke of the piston to compress the charge in the cylinder will. he vaporized and admixed with air from the crank case and delivered therefrom completion o-f the working stroke of the said piston.

n a two cycle internal combustion engine,v a cylinder, a vapourizing ber formed in the head thereof, a port for admitting fuel to the said chamber, a

n a two cycle internal combustion engine, a cylinder having a vapourizing chamer 'ormed in the head thereof, a port for a passage from the vapourizing chamber direct to the crank case of the cylinder, and an air inlet to the crank case.

'7. In a two cycle internal combustion engine, a cylinder having a vapourizing chamber formed in the head, a port for admitting fuel to the said chamber, a valve normallyecovering said port, a

charge ada. crank case, a passage from the crank case to the charge admission port. a; passage from the vapourizing chamber direct to the crank case, an air inlet port in t-he crank case, and a valve normally covering the said air inlet port.

8. In a two cycle internal combustion engine, a cylinder having a preheating cham- `a vapourizing chamber fitted to the a carburetter interposed bethe said chamber during the compression stroke of the piston in the cylinder.

9. n a two cycle internal preheating chamber. a vapourizing chamber formed in the head of the cylinder and arranged in communication with the Apreheating chamber, a. valve adapted to be operated to permit regulated supplies of fuel to pass to the vapourizing chamber. a piston in the cylinder, a crank case, an air inlet valve in ,to the crank case, a passage the crank case, means for inducing a flow of air to the cylinder at the completion of the working stroke of the piston and for inducing a flow of air from the crank case through the vapourizing chamber to the charge inlet port in the side of the cylinder prior to the commencement of the compression stroke of the piston in the cylinder.

l0. ln a two cycle internal combustion engine, the'combination of a cylinder having a preheating chamber and a vapourizing chamber formed in the head thereof. a carburetter interposed between and 'arranged in communication with the said chambers, a piston in the cylinder, a valve in thepassageway between the carburetter and the vapourizing chamber. adapted to be operated to permit regulated quantities of atomized fue-l to pass to the said chamber during the compression of the charge within the cylinder by the movement of the pistoni, acharge inlet port n the side of the cylinder, a crank ease, passages passing from the said'charge inlet port to the vapourizing chamber and leading from the crank case to the vapourizing chamber, and an air inlet valve in the crank case adapted to open a little later than the valve Con trollingthe admission of fuel and air to the vapourizing chamber.

11. In a twol cycle internal combustion engine, a cylinder having a preheating chamber formed on the head thereof7 a vapourizing chamber formed in the head of the cylinder, a passage lea-ding from the preheating chamber to a port opening into the vapourizing chamber, a valve adapted to open during the compression of a charge in the cylinder the piston to admitpreheated fuel to the 4vapourizing chamber, a crank case7 a charge admission port in the cylinder, passages leading from the vapourizing chamber to the charge admission port in the cylinder and to the crank case, and an air inletl port in the crank case through which air is admitted during the compression stroke of the piston` constructed and arranged whereby the air admitted to the crank case will he admixed with the vapourized fuel and passed through the charge inlet port to the cylinder on the completion of the working stroke of the piston.

1Q. ln a two cycle internal combustion engine. a cylinder having a preheating chainber formed on the head thereof, a carbureter having a ioat chamber arranged in communication with the said chamber, a vaporizing chamber on the head of the cylinder, a port leading to the vaporizing chamber. a passage leading from the fioat chamber to theport leading into the vaporizing chamber, an atomizing nipple in said passage, an air inlet to the said passage, al valve normally covering the port, lever and link mechanism operated from the crank shaft for operating the valve, two ports in the vaporizing chamber,A a charge admission port in the cylinder, a pipe from one port in the vaporizing chamber to the charge admission port, a crank oase, a passa-ge leading from the charge admission port to the crank case, a. pipe connecting the second port in the vaporizing chamber to the crank case, an air inlet port in the crank case, a timing gear, and a valve covering the said air inlet port adapted to open automatically under the influence of a minus pressure in the said crank case and by the timing gear when the piston is moving forward on its compression stroke in the cylinder.,

ln testimony whereof l have aixed my signature in the presence of two witnesses.

FRANK STAFFGRD JELBAR'.

Vitnesses:

lll/v. D. RED,

DORIS l. PITTARD. 

